Carburetor control safety linkage



J1me 1965 2. R. CHELMINSKI ETAL 3,138,378

CARBURETOR CONTROL SAFETY LINKAGE Filed April 9, 1962 V ll (l TORS United States Patent 3,188,878 CARBURETOR CONTROL SAFETY LINKAGE Zygmunt R. Chelminski, 416 S Mason, Bensenville, Ill.,

and Edward H. Wagner, 408 Elmhurst Road, Elmhurst, Ill.

Filed Apr. 9, 1962, Ser. No. 186,246 2 Claims. (Cl. 74-470) This invention relates to control or operating linkages for internal combustion engines and the like.

The invention comprehends a novel throttle control linkage for carburetors and in particularly adaptable for application in an arrangement for simultaneously operting the throttle mechanisms of a plurality of cooperatively associated engines though not necessarily restricted thereto.

A general object of the invention is to provide a novel resilient, self-adjusting linkage which is simple to apply and which accommodates variations in travel between simultaneously operated controls without in any way imposing undue or excessive breaking stresses upon the shorter traveled control while accommodating further travel of the longer traveled control.

Another object is to provide a novel linkage which is self-compensating in that it accommodates simultaneous travel of several controls without the necessity of minutely synchronizing their travel.

A further object is to devise in the linkage described a novel stop for regulating return movements of the linkage.

These and other objects and advantages inherent in and encompassed by the invention will become more readily apparent from the specifications and the drawings where- FIGURE 1 is a perspective view of a plural engine application with the novel throttle control linkage applied thereto; and

FIGURE 2 is an enlarged sectional view taken essentially on line 2-2 of FIGURE 1.

Description of the invention Describing the invention in detail and having particuular reference to the drawings, there is shown a vehicle 2 with a wheel 4 at each side which is connected to a sprocket 6 and chain driven from a sprocket 8 constrained for rotation with the output shaft 9 such as the crankshaft of an associated engine 10.

Each engine 10, there being two shown, comprises a carburetor 12 with a conventional throttle generally designated 14 and which includes a butterfly shaft 16 with lever arm 18 having a perforation 20 which admits a bent end portion 22 of an output rod 24 which is part of the operating linkage generally indicated 26.

Each operating linkage 26 comprises a cylinder or reaction element 28 which has end walls or abutments 30 and 32 with perforations 34 and 36. The perforation 34 admits an inner end portion 38 of rod 24, said end portion 38 extending into the cylinder 28 through a compression spring 40 therein. The spring 40 seats at one end as at 42 against wall 34 and at the other end against the guide collar and abutment member 44 which peripherally complementally fits within the interior 46 of the cylinder and is slidable axially thereof.

The end 48 of rod 24 projects beyond the element 44 and in the extended position of the spring engages and abuts the adjacent inner end 50 of the output rod 52 which at its inner end portion 54 is provided with a stop and guide collar 56 also peripherally complementally engaging the cylindrical surface 46 of the cylinder and in the extended position of spring 40 engages with its Patented June 15, 1965 outer side 58 the interior side 60 of wall 32 of the cylinder. The rod 52. extends through opening 36 and at its opposite end 62 extends through and is lengthwise adjustably secured to an anchor pivot pin 64 which is pivotally connected to a lever arm 66 on a rockshaft 68 which is journalled on the vehicle frame 70. The rockshaft 68 is connected to a lever arm 72 which is connected by a pull rod 74 to a lever arm 76 on a counter shaft 78 journalled on frame bearings 80, 80. Shaft 78 has an arm 82 which is connected to a pull rod 84 suitably connected to throttle foot pedal 83 or other operator.

The invention also comprehends the provision of novel position control safety linkages 85 in parallel with the operating linkages. Each linkage 85 comprises a cylinder 86 with a compression spring 88 therein. Spring 88 is sleeved over a rod 90 and stressed between the end wall 92 of cylinder 86 and the opposing guide and abutment collar 94 on the inner end of rod 90. Collar 94 slidably engages the complementary cylindrical interior periphery 96 of cylinder 86. The outer end of rod 90 is pivotally connected through pin 98 to an arm 100 on the'rockshaft 68, the pin 98 having an aperture 102 through which rod 90 extends and the rod is secured by the bolt 104 threaded into the end of pin 98 and extending into opening 102 against rod 90.

Similarly rod 106 has its outer end adjustably secured to the pivot anchor pin 108 which is pivotally connected to suitable engine structure. The inner end of rod 106 extends through opening 110 in end wall 112 of the cylinder 86 and has a cylindrical collar 114 fastened thereto, the collar 114 abutting the wall 112.

It will be readily understood that the return movement of the linkage is readily governed by the position of securement of the rods 90 and 106 to their respective anchors and that maximum movement in the return direction is governed by abutment of the inner ends 116 and 118 of the rods 90 and 106.

It will be observed that in the instant arrangement the springs in the control safety linkages have a /2 inch travel and in the operating assemblies a one inch travel. The proportions may be varied as required. Thus in the instant structure operating linkage is relatively elastic whereas the control safety linkage obtains a fast return and determines the maximum extent of travel of the operating linkage in both directions. At the same time the travel of one control linkage in no way inhibits over travel by the other. The linkages are therefore compensators for inaccuracies in the manufacturing tolerances of the several throttle units.

It will be readily observed that a novel and simple struc ture has been devised for operating either one or a plurality of controls, the structure being relatively simple to manufacture, but providing efficient action and performance.

Having described a preferred form of the invention, it will be readily apparent that other embodiments will now become readily apparent within the scope of the appended claims.

We claim:

1. For use in a vehicle having a plurality of wheel-driving engines each including throttle means, a throttle operating rockshaft pivotally supported on the vehicle, a pair of arms for each engine connected to the rockshaft, control and operating linkages disposed in parallel for each engine, the improvement comprising: said control and operating linkages each including input and output rods coaxially disposed and having inner ends, spring means over the inner end of one rod, abutment means on the inner ends of the rods, a reaction element having abutments outwardly of said abutment means, said spring means disposed between one of the abutments and one of the abutment means, one rod of each control linkage References Cited by the Examiner UNITED STATES PATENTS Carter 74661 X Pugh et al. 74470 X Alexander 74470 X Vanke 74526 Ferguson et al 74470 X Libby 74470 X 10 BROUGHTON G. DURHAM, Primary Examiner. 

1. FOR USE IN A VEHICLE HAVING A PLURALITY A WHEEL-DRIVING ENGINES EACH INCLUDING THROTTLE MEANS, A THROTTLE OPERATING ROCKSHAFT PIVOTALLY SUPPORTED ON THE VEHICLE A PAIR OF ARMS FOR EACH ENGINE CONNECTED TO THE ROCKSHAFT, CONTROL AND OPERATING LINKAGES DISPOSED IN PARALLEL FOR EACH ENGINE, THE IMPROVEMENT COMPRISING: SAID CONTROL AND OPERATING LINKAGES EACH INCLUDING INPUT AND OUTPUT RODS COAXIALLY DISPOSED AND HAVING INNER ENDS, SPRING MEANS OVER THE INNER END OF ONE ROD, ABUTMENT MEANS ON THE INNER ENDS OF THE RODS, A REACTION ELEMENT HAVING ABUTMENTS OUTWARDLY OF SAID ABUTMENT MEANS, SAID SPRING MEANS DISPOSED BETWEEN ONE OF THE ABUTMENTS AND ONE OF THE ABUTMENT MEANS, ONE ROD OF EACH CONTROL LINKAGE AND OPERATING LINKAGE HAVING MEANS FOR CONNECTION TO AN 